Apparatus for burning lime.



P. A. & E. J. WALSH.

APPARATUS FOR BURNING LIME.

APPLICATION FILED NOV. 18. I9l4. v

Patented July 18, 1916.

2 SHEETS-SHEET 1 WWI mom P. A. & E. J. WALSH,

APPARATUS FOR BURNING LIME.

' APFUCATlON FILED NOV-18,1914.

1,191,752. Patented J111y18,1916.

2 SHEETS-SHEET 2.

7 F 1 :1 I 1 Ram/aim m5 NORRIS #215175 00.. PNum-UTHQ. wAsHwarcu. n. L.

, UNITED. STATES PATENT ()FFIC PATRICK A. WALSH AND EDWARD J. WALSH, OF ROUND ROCK, TEXAS.

APPARATUS FOR BURNING LIME.

Specification of Letters Patent. Patented July 18, 1916.

Application filed November 18, 1914. Serial No. 872,814.

To all whom it may concern:

Be it known that we, PATRICK A. WALSH and EDWARD J. WALSH, citizens of the United States, residing at Round Rock, in the county of Williamson and State of Texas, have invented certain new and useful Improvements in Apparatus for Burning Lime; and we do hereby declare the following to'be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains-to make and use the same.

This invention relates to apparatus for burning lime, and one of the principal objects of the invention is to provide reliable and efficient means to extract all the heat units from the fuel to be used by providing an increase draft and a long blaze through the burning fuel into the limekiln compartment, and to provide means whereby the increase draft of air is pre-heated before itpasses through the bed of fuel.

Another object of the invention is to economize in fuel by aiding the combustion of the fuel by means of a column of hot air passing through the grate bars and bed of fuel, thus making it possible to burn lignite and to extract the greatest possible number of heat units from said fuel.

The foregoing and other objects may be attained by means of the construction illustrated in the accompanying drawings, 1n which, I

Figure 1 is a View in elevation of a limekiln made in accordance with this invention, Fig. 2 is a sectional view taken through the firebox, the ash pit, and the inclined air shaft under the fire-box or furnace, Fig. 3' is a horizontal sectional View taken on a line immediately above the fire grate, and Fig. 4 is a detail sectional view of the air shaft. 7

Referring to the drawings by reference middle by I bars or beams 6. The bars of the grates 5 are spaced apart sufliciently to permit the lignite as it crumbles duringcombustion tofall therethrough, so that the air used to support combustion will be heated and mixed with products of combustion before it enters the combustion chambers 3.

Below each combustion chamber 3. is an ash pit 7 which is provided with a constricted opening into the atmosphere. From the ash pit a rearwardly inclined air shaft 8 extends up to .an enlarged distributing chamber 5 which is located immediately below the grate 5. The width of the air shaft 8 is equal to that of the grate 5 and its depth is less than that of the grate. The front and rear walls 10 and 10-, respectively, of the air shaft 8 are inclined and they are smooth to prevent the accumulation thereon 'of burning particles of lignite falling through the grate 5. Air can enter the air shaft 8 only through the constricted opening of the ash pit 7 and as the outer ends of the combustion chambers 3 are closed by the doors 3 air can 'enter the combustion chambers only throughthe air shaft.

The front and rear walls 5 and 5, respectively, of'the distributing chamber 5 inc1ine downwardly in opposite directions fi'om the front and rear ends of the grate 5 to the upper ends of the inclined walls 10 and 10 of the air shaft 8, and they are smooth to prevent the accumulation thereon of burning particles of lignite falling through the grate 5. Those burning particles of lignite that fall through the rear portion of the grate 5 are directed by the rear wall 5 on to the rear wall 10 of the air shaft 8, such particles traveling down said wall 1O into the ash pit 7, heating said wall 10 and air traveling up the air shaft 8 against said wall. Those burning particles of lignite falling through the front portion of the grate 5, .are directed by the wall 5 of the distributing chamber 5 beyond the upper end of the front wall 10 of the air shaft 8 forming a curtain of burning particles of lignite which travels downwardly throughout the entire length of the air shaft to the ash pit. All particles of lignite falling through the grate 5 form a bed of burning fuel in the ash pit 7.

As stated before, the air to. support combustion enters through the constricted opening of the ash pit 7, passing first over the bed ofburning fuel in the ash pit. The air as it enters the ash pit becomes heated and mixed Withproducts of combustion and as it travels up the air shaft 8 it passes through the curtain of falling particles of burning lignite and through the burning particles of lignite traveling down the wall 10 of the air shaft, becoming heated to a greater degree and being mixed with a greater percentage of products of combustion. As the airleaves the air shaft 8 it enters the distributing chamber 5. It is again heated in this chamber and mixedwith products of combustion and is finally distributed by-this chamber throughout the entire width and depth of the grate-.- It should therefore, be apparent that the air to support combustion is heated to a high degree and thoroughly mixed with products of combustion before it passes through the grate This renders it possible to burn lignite and extract therefrom all of the heat units and to produce a long flame in the cylinder 1.

What is claimed is A lignite burning lime kiln comprising a combustion chamber, a grate in said chamber having the bars thereof spaced to permit particles of burning lignite to fall Y therethrou'gh, an air distributing chamber located immediately below said grate and having downwardly converging front and rear walls, the inner surfaces of said walls being smooth to prevent the accumulation thereon of burning particles of lignite, an ash pit located below said distributing chamber and having a constricted air inlet opening, and an inclined air shaft equal in width to the width of the grate and having a depth less than the depth of the grate,

said air shaft extending from the ash pit to the lower end of the distributing chamber and having inclined front and rear walls, the inner surfaces of these latter walls beingsmooth to prevent the accumulation thereon of the burning lignite particl'es, the inclination of the front and rear walls of the distributing chamber being greater than the inclination of the front and rear walls of the air shaft and extending from the upper ends ofthe latter walls to the front and rear. ends of the grate in opposite directions beyond said latter walls, the said rear wall of the distributing chamber conveying the burning particles of lignit'e falling from the rear portion of the grate on to the saidrear wall of the air shaft, and said frontwall of the distributing chamber causing the burning particles of li-gnite falling from the front portion of said grate to fall the entire length of the air shaft, said air shaft receiving all the air used to support combustion and all of said air entering the shaft through the constricted opening of the ash pit, whereby lignite which is partially consumed in the grate will'fall therethrough as it crumbles before it is consumed and being burned either in the air shaft or ash pit producing a long flame in the lime kiln.

In testimony whereof we aflix our signatures in presence of two Witnesses.

PATRICK A. WALSH. EDWVARD J WALSH.

lVitnesses: V

E. V. THORP, E. W. SwENsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

